#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>
using namespace std;
class Solution {
public:
    int uniquePathsWithObstacles(vector<vector<int>>& ob) {
        int m = ob.size(), n = ob[0].size();
        vector<vector<int>> as(m + 1, vector<int>(n + 1));
        as[0][1] = 1;
        for (int i = 1; i <= m; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                if (ob[i - 1][j - 1] == 0)
                {
                    as[i][j] = as[i - 1][j] + as[i][j - 1];
                }
            }
        }
        return as[m][n];
    }
};